Lower electrode structure for welding



FIG. 1 is a front view of a lower electrode structure for welding showing my new design;

FIG. 2 is back view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof;

FIG. 7 is a perspective view thereof with case removed showing an alternate condition of use in which a nut positioning pin is attached; and,

FIG. 8 is a perspective view thereof with case removed showing an alternate condition of use in which a bolt positioning pin is attached. 

The ornamental designs for a lower electrode structure for welding, as shown and described. 